Custom Post Type Taxonomies -Posts not showing in Category or Tag pages

Question

I have a made a custom post type called "Member Resources" the posts under this CPT have a few taxonomies such as categories and tags.

Tags = "Diversity" Categories = "Guidance"

When I go to the following urls:

www.domain.com/tags/diversity

www.domain.com/tags/guidance

No posts appear.

Though I have set public => true on the CPT function.

Posts are displaying if you go to the Member Resources archive page though, so they are displaying, but not when you filter them by taxonomies.

Any help would be appreciated!

Thanks.

Answer 1

You were close with the code you posted in your comment. The issue is that you only tested for is_main_query, which will limit every query on your site to that single post type.

function wpa82763_custom_type_in_categories( $query ) {
    if ( $query->is_main_query()
    && ( $query->is_category() || $query->is_tag() ) ) {
        $query->set( 'post_type', array( 'post', 'resource' ) );
    }
}
add_action( 'pre_get_posts', 'wpa82763_custom_type_in_categories' );